变压器磁铁固定座全自动级进式精密注塑模设计

根据变压器磁铁固定座结构特点,用辅助料带将金属端子串联在一起,再通过气缸和双推板脱模机构,使注塑模具能够像冲压模具那样可以进行全自动级进式进料和脱模。同时模具采用浮动式侧向抽芯机构,巧妙地解决了料带定位镶件和滑块相互干涉的问题。模具结构先进合理、快速高效,塑件尺寸精度得到了大幅提高。     

基于自动送料的嵌件端子注塑模设计

以某变压器自动送料嵌件端子注塑模为研究对象,对注塑模的设计要求和关键技术进行了分析,同时对注塑模设计过程中塑件制品的结构、注塑模具的结构、推出系统和自动送料系统、侧向抽芯结构、模具工作过程及注意事项进行了研究。基于上述分析和研究,设计了一种精度较高、无脱模斜度、成型零件全部采用镶拼结构、易于排气、生产率高且经济效益较好的注塑模具。     

4次分型潜伏浇口2次推出色拉油壶口注塑模

介绍了色拉油壶口注塑模实用结构,论述了模具结构特点和工作原理。色拉油壶口制件共有4处需要强制脱模。模具为六板式,4次分型,一模四腔,潜伏式浇口进料,2次推出,制件强制脱模。模具结构紧凑、工作可靠,可实现全自动操作。     

汽车安全气囊饰盖二次顶出注塑模具设计

分析了汽车安全气囊饰盖的结构特点,鉴于其倒扣与加强凸筋同时存在,常规斜顶机构与塑件制品加强凸筋形成干涉,设计了一套具有旋转动作的二次顶出脱模机构的注塑模具。塑件制品分两次顶出,在第一次顶出时加入了旋转动作,解决了该类塑件制品的倒扣脱模问题。模具浇注系统设计采用开放式热流道转冷流道,潜伏式浇口与牛角浇口两点进胶,保证了塑料熔体在模腔内的良好流动性。模具已投入实际生产中,模具工作性能稳定,生产的塑件制品满足要求。     

打火机上盖注塑模设计

针对打火机外壳要求防水、耐摔、耐压、耐热的特点,提出采用聚碳酸酯制作打火机外壳上盖的注射成型工艺和模具设计方案;采用香蕉形状的曲线形潜伏式浇口结构形式和自动旋转方式分别进行进浇和脱模。经生产实践证明,该模具结构设计合理,满足成型工艺要求,脱模动作可靠,制品质量好。     

隔板式活络模在混杂型GFRP舱垫板中的应用

众所周知,成型GFRP制品所采用的模具形式,是根据制品的内、外表面的光洁度及平整要求而定的。通常不外乎阴模或阳模二种。但随着GFRP制品应用范围的不断扩大,单纯的阴、阳模成型已不能适应某些GFRP制品的需要,需在阴、阳模的基础上,向外衍生。故在摸索GFRP混杂型结构的舱垫板(以下简称舱垫板)成型工艺时,按制品的结构特点,提出一种成型简单、脱模方便、成本低、效率高的隔板式活络模具结构。经工艺实践,脱模后的舱垫板表面平整,光亮如镜,效果良好。下面对制品的结构、模具特点及成型工艺等进行介绍。     

汽车副仪表板注塑模设计

用CAE分析软件(Moldflow)对塑料件进行模流分析,选择针阀式热流道、搭接式浇口进胶方式,采用分体式滑块结构减少加工量和加工变形,在大滑块上设计弹块和成型拉块辅助脱模机构,保证产品不粘滑块,可以使产品在向外变形状态时顶出,解决了塑料件侧壁脱模时倒扣的干涉问题。设计了大滑块与型芯及型腔的定位结构,模具结构可靠,注塑产品成型完整,脱模顺利。采用模具快速接插接头系统实现模具注塑装夹时的快速切换,提高了生产效率。在汽车副仪表板模具的开发方面,有一定技术参考价值     

如何选择脱模剂

注塑制品脱模顺利与否主要取决于成型模具结构的合理设计和注塑制品工艺参数的合理选择。在注射成型生产中，由于工艺条件的波动，有时也会出现制品脱模困难的现象。为了保证制品注射成型的生产顺利进行，避免因制品脱模困难而造成制品生产周期延长，成型模具的型腔表面要喷涂或擦涂一层脱模剂。     

LED支架全自动精密注塑系统开发研究

根据LED支架的结构特点,研究成功了一套全自动精密注塑成型系统。重点分析和研究了该系统的自动送料和脱模系统、原材料选用、自动注塑成型系统以及该系统的创新点和特色。系统投产后,运行稳定,LED支架生产率提高了50%左右,尺寸精度提高了1~2级,人员节省了75%。     

桑塔纳轿车扣锁注塑模的设计

介绍了桑塔纳轿车扣锁注塑模的设计，根据制品的形状特征和外观要求，模具采用了推板和顶杆联合顶出脱模的两板式、侧面进浇的平缝式浇口结构；由于制件带有铝合金的金属嵌件，因此，在动模型芯中的顶出系统设有弹簧先行复位机构，以保证合模前能将镶块顺利地放入，合模后才可进行注射成型。     

Insect antifeedant properties of anthranoids from the genusVismia

Vismiones and ferruginins, representatives of a new class of lypophilic anthranoids from the genusVismia were found to inhibit feeding in larvae of species ofSpodoptera, Heliothis, and inLocusta migratoria.     

Direct observation of freeze-thaw instability of latex coatings via high pressure freezing and cryogenic SEM

Despite its industrial importance, the subject of freeze-thaw (F/T) stability of latex coatings has not been studied extensively. There is also a lack of fundamental understanding about the process and the mechanisms through which a coating becomes destabilized. High pressure (2100 bar) freezing fixes the state of water-suspended particles of polymer binder and inorganic pigments without the growth of ice crystals during freezing that produce artifacts in direct imaging scanning electron microscopy (SEM) of fracture surfaces of frozen coatings. We show that by incorporating copolymerizable functional monomers, it is possible to achieve F/T stability in polymer latexes and in low-VOC paints, as judged by the microstructures revealed by the cryogenic SEM technique. Particle coalescence as well as pigment segregation in F/T unstable systems are visualized. In order to achieve F/T stability in paints, latex particles must not flocculate and should provide protection to inorganic pigment and extender particles. Because of the unique capabilities of the cryogenic SEM, we are able to separate the effects of freezing and thawing, and study the influence of the rate of freezing and thawing on F/T stability. Destabilization can be caused by either freezing or thawing. A slow freezing process is more detrimental to F/T stability than a fast freezing process; the latter actually preserves suspension stability during freezing. Presented at the 82nd Annual Meeting of the Federation of Societies for Coatings Technology, October 27–29, 2004 in Chicago, IL. Tied for first place in The John A. Gordon Best Paper Competition.     

Ethanol and (−)-α-Pinene: Attractant Kairomones for Bark and Ambrosia Beetles in the Southeastern US

In 2002–2004, we examined the flight responses of 49 species of native and exotic bark and ambrosia beetles (Coleoptera: Scolytidae and Platypodidae) to traps baited with ethanol and/or (−)-α-pinene in the southeastern US. Eight field trials were conducted in mature pine stands in Alabama, Florida, Georgia, North Carolina, and South Carolina. Funnel traps baited with ethanol lures (release rate, about 0.6 g/day at 25–28°C) were attractive to ten species of ambrosia beetles (Ambrosiodmus tachygraphus, Anisandrus sayi, Dryoxylon onoharaensum, Monarthrum mali, Xyleborinus saxesenii, Xyleborus affinis, Xyleborus ferrugineus, Xylosandrus compactus, Xylosandrus crassiusculus, and Xylosandrus germanus) and two species of bark beetles (Cryptocarenus heveae and Hypothenemus sp.). Traps baited with (−)-α-pinene lures (release rate, 2–6 g/day at 25–28°C) were attractive to five bark beetle species (Dendroctonus terebrans, Hylastes porculus, Hylastes salebrosus, Hylastes tenuis, and Ips grandicollis) and one platypodid ambrosia beetle species (Myoplatypus flavicornis). Ethanol enhanced responses of some species (Xyleborus pubescens, H. porculus, H. salebrosus, H. tenuis, and Pityophthorus cariniceps) to traps baited with (−)-α-pinene in some locations. (−)-α-Pinene interrupted the response of some ambrosia beetle species to traps baited with ethanol, but only the response of D. onoharaensum was interrupted consistently at most locations. Of 23 species of ambrosia beetles captured in our field trials, nine were exotic and accounted for 70–97% of total catches of ambrosia beetles. Our results provide support for the continued use of separate traps baited with ethanol alone and ethanol with (−)-α-pinene to detect and monitor common bark and ambrosia beetles from the southeastern region of the US.     

Methyl 2,4,6-decatrienoates Attract Stink Bugs and Tachinid Parasitoids

Halyomorpha halys (Stål) (Pentatomidae), called the brown marmorated stink bug (BMSB), is a newly invasive species in the eastern USA that is rapidly spreading from the original point of establishment in Allentown, PA. In its native range, the BMSB is reportedly attracted to methyl (E,E,Z)-2,4,6-decatrienoate, the male-produced pheromone of another pentatomid common in eastern Asia, Plautia stali Scott. In North America, Thyanta spp. are the only pentatomids known to produce methyl 2,4,6-decatrienoate [the (E,Z,Z)-isomer] as part of their pheromones. Methyl 2,4,6-decatrienoates were field-tested in Maryland to monitor the spread of the BMSB and to explore the possibility that Thyanta spp. are an alternate host for parasitic tachinid flies that use stink bug pheromones as host-finding kairomones. Here we report the first captures of adult and nymph BMSBs in traps baited with methyl (E,E,Z)-2,4,6-decatrienoate in central Maryland and present data verifying that the tachinid, Euclytia flava (Townsend), exploits methyl (E,Z,Z)-2,4,6-decatrienoate as a kairomone. We also report the unexpected finding that various isomers of methyl 2,4,6-decatrienoate attract Acrosternum hilare (Say), although this bug apparently does not produce methyl decatrienoates. Other stink bugs and tachinids native to North America were also attracted to methyl 2,4,6-decatrienoates. These data indicate there are Heteroptera in North America in addition to Thyanta spp. that probably use methyl 2,4,6-decatrienoates as pheromones. The evidence that some pentatomids exploit the pheromones of other true bugs as kairomones to find food or to congregate as a passive defense against tachinid parasitism is discussed.     

2007～2008年世界塑料工业进展

收集了2007年7月～2008年6月世界塑料工业的相关资料,介绍了2007～2008年国外塑料工业的发展情况,提供了世界塑料产量、消费量及全球各类树脂的需求量及产能情况.按通用热塑性树脂(聚乙烯、聚丙烯、聚苯乙烯、聚氯乙烯、ABS树脂)、工程塑料(尼龙、聚碳酸酯、聚甲醛、热塑性聚酯、聚苯醚)、特种工程塑料(聚苯·硫醚、液晶聚合物、聚醚醚酮)、通用热固性树脂(酚醛、聚氨酯、不饱和聚酯树脂、环氧树脂)不同品种的顺序,对树脂的产量、消费量、供需状况及合成工艺、产品应用开发、树脂品种的延伸及应用的进一步扩展等技术作了详细介绍.     

2005～2006年国外塑料工业进展

收集了2005年7月～2006年6月国外塑料工业的相关资料,介绍了2005—2006年国外塑料工业的发展情况。提供了世界塑料产量、消费量及全球各类树脂生产量以及各国塑料制品的进出口情况。作为对比,介绍了中国塑料的生产情况。按通用热塑性树脂（聚乙烯、聚丙烯、聚苯乙烯、聚氯乙烯、ABS树脂）、工程塑料（聚酰胺、聚碳酸酯、聚甲醛、热塑性聚酯、聚苯醚）、通用热固性树脂（酚醛、聚氨酯、不饱和树脂、环氧树脂）、特种工程塑料（聚苯硫醚、液晶聚合物、聚醚醚酮）的品种顺序,对树脂的产量、消费量、供需状况及合成工艺、产品开发、树脂品种的延伸及应用的扩展作了详细的介绍。